package day07;

import java.util.Random;
import java.util.Scanner;

public class verificationCode2 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int a = scanner.nextInt();
        System.out.println(code(a));
    }
    public static String code(int a){
        String codes = "";
        Random random = new Random();
        char[] chs = {'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x',
                'y','z','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T',
                'U','V','W','X','Y','Z','1','2','3','4','5','6','7','8','9','0'};
        for (int i = 0;i<a;i++){
            int sum =random.nextInt(chs.length);
            codes += chs[sum];
        }
        return codes;
    }
}
